require File.expand_path('../../../spec_helper', __FILE__)

ruby_version_is "1.9" do
  describe "Symbol#<=> with Symbol" do
    it "compares individual characters based on their ascii value" do
      ascii_order = Array.new(256) { |x| x.chr.to_sym }
      sort_order = ascii_order.sort
      sort_order.should == ascii_order
    end

    it "returns -1 when self is less than other" do
      (:this <=> :those).should == -1
    end

    it "returns 0 when self is equal to other" do
      (:yep <=> :yep).should == 0
    end

    it "returns 1 when self is greater than other" do
      (:yoddle <=> :griddle).should == 1
    end

    it "considers symbol that comes lexicographically first to be less if the symbols have same size" do
      (:aba <=> :abc).should == -1
      (:abc <=> :aba).should == 1
    end

    it "doesn't consider shorter string to be less if longer string starts with shorter one" do
      (:abc <=> :abcd).should == -1
      (:abcd <=> :abc).should == 1
    end

    it "compares shorter string with corresponding number of first chars of longer string" do
      (:abx <=> :abcd).should == 1
      (:abcd <=> :abx).should == -1
    end
  end

  # Note: This is inconsistent with Array#<=> which calls #to_ary instead of
  # just using it as an indicator.
  describe "Symbol#<=>" do
    it "returns nil if its argument does not provide #to_sym" do
      (:abc <=> 1).should == nil
      (:abc <=> mock('x')).should == nil
    end

    it "returns nil if its argument does not provide #<=>" do
      obj = mock('x')
      (:abc <=> obj).should == nil
    end
  end
end
